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Creator
- Tharp, W. E. (William Edgar)9
- Jones, Grove B., 1877-7
- Hurst, Lewis A. (Lewis Alexander), 1874-4
- Bushnell, T. M. (Thomas Mark), 1889-19763
- United States. Bureau of Soils3
- Indiana. Department of Geology and Natural Resources2
- Mangum, A. W.2
- Neill, N. P. (Nelson Prentice)2
- Ulrich, H. P. (Herbert Paul), 1904-2
- Bennett, Frank (Cartographer)1
- Buckhannan, W. H. (William Henry), 1901-1
- Burke, R. T. Avon (Richard Thomas Avon), 1878-1
- Geib, W. J. (Warren Jacob), 1880-1
- Grimes, E. J. (Earl Jerome)1
- Hendrickson, B. H. (Bertram Higbie), 1892-1
- Hertenstein, Earl1
- Marean, Herbert W.1
- Middleton, Philip (Soil surveyor)1
- Miller, J. T. (John T.), 1906-1
- Watkins, W. I. (William Isaac), 1888-19731